Release 2.8.2: move settle set to pympp 0.11 + x402 2.21 (verified)

[vvillait88]

Summary

Releases agentscore-commerce 2.8.2, moving the coupled MPP settle set forward: pympp 0.10.1 -> 0.11.0 and x402 2.20.0 -> 2.21.0. Both were verified against the registry's gate (run in full this time, not deferred):

• pympp 0.11 switches credential canonicalization to RFC 8785 / JCS, which is exactly what mppx 0.9.1 (the JS counterpart) already uses — so the two implementations align rather than diverge. pympp has no EIP-712 zero-amount proof (that domain-v3 mechanism is mppx-only), so the mppx-0.8.0 break class does not apply. 0.11's Mpp.create now reads .name off each method; the one test that stubbed a bare object() is updated to a method-shaped stub.
• x402 2.21 leaves the Base mainnet USDC EIP-712 domain unchanged (all USD Coin entries still version: "2"); 2.21 only refactored constants.py into default_assets.py. No wire change on the rail we settle.

Type of change

• Docs, tests, or internal maintenance only
• Bug fix (no breaking change)
• New feature (no breaking change)
• Breaking change (existing callers must update)

Public API

None. No exported symbols or wire formats changed; this bumps two peer-dep versions and updates one test stub for pympp 0.11's .name method contract.

Test plan

uv run pytest (1868 passed, 4 skipped, 95.37% coverage), uv run ruff check + ruff format --check + uv run ty check all clean — ty validates the pympp-0.11 / x402-2.21 API surface our code calls. Standing obligation: a live all-rails settle against a pympp-0.11 merchant is the final cross-implementation confirmation and runs as a post-deploy smoke.

Checklist

• Tests cover the new behavior, and the suite passes locally
• Lint, format, and type checks pass
• Docs and README examples updated if the public surface changed
• No secrets, credentials, or personal data in the diff or the tests